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Property, Plant and Equipment, Net (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Property, plant and equipment [Abstract]      
Property, plant and equipment, net $ 101,031 $ 101,031 $ 97,403
Service Life      
Property, plant and equipment [Abstract]      
Decrease in manufacturing costs as a result of lower depreciation $ 300 $ 600  
Decrease in net loss per share, basic and diluted, as a result of lower depreciation $ 0.01 $ 0.02  
Machinery and equipment      
Property, plant and equipment [Abstract]      
Property, plant and equipment, gross $ 45,383 $ 45,383 45,742
Less: accumulated depreciation and amortization (37,252) (37,252) (37,115)
Building      
Property, plant and equipment [Abstract]      
Property, plant and equipment, gross 38,370 38,370 38,837
Less: accumulated depreciation and amortization (13,212) (13,212) (12,736)
Leasehold improvements      
Property, plant and equipment [Abstract]      
Property, plant and equipment, gross 5,604 5,604 4,877
Less: accumulated depreciation and amortization (4,146) (4,146) (4,035)
Construction in progress      
Property, plant and equipment [Abstract]      
Property, plant and equipment, gross 66,284 66,284 61,833
Construction in progress Dingxin and Kazuo locations      
Property, plant and equipment [Abstract]      
Property, plant and equipment, gross 53,100 53,100 48,800
Construction in progress manufacturing equipment purchases      
Property, plant and equipment [Abstract]      
Property, plant and equipment, gross 3,700 3,700 3,400
Construction in progress other consolidated subsidiaries      
Property, plant and equipment [Abstract]      
Property, plant and equipment, gross $ 9,500 $ 9,500 $ 9,600